Nestled along the Malabar Coast in northern Kerala, Kannur occupies a distinctive geographic position that profoundly shapes its urban character and air quality dynamics. The city sits at approximately 11.8745°N latitude and 75.3704°E longitude, with an elevation generally below 50 meters above sea level, creating a low-lying coastal topography. Kannur's urban core blends with surrounding rural landscapes, featuring a gradual urban–rural gradient where traditional industries like beedi manufacturing and handloom weaving transition into agricultural zones dominated by cashew plantations and coconut groves. The city is flanked by the Arabian Sea to the west, which moderates temperatures but also contributes to humidity that can trap pollutants, while the Western Ghats rise to the east, creating a rain shadow effect during certain seasons. This proximity to both sea and mountains influences local wind patterns, with sea breezes potentially dispersing pollutants inland during daytime but sometimes allowing accumulation under stable atmospheric conditions. The fishing harbour at Ayikkara adds maritime diesel emissions to the mix, while road dust from unpaved peripheral areas combines with vehicle exhaust from the city's growing transportation network. Kannur's position within Kerala's northern industrial belt, though less intensive than southern regions, means localized pollution from small-scale processing units becomes concentrated in residential-commercial areas, creating micro-environments of poorer air quality amidst generally moderate regional conditions.

Kannur's tropical monsoon climate creates a distinct seasonal rhythm in air quality that residents and visitors should understand for health planning. During the dry season from February to April, pollution reaches its peak as reduced rainfall allows particulate matter from vehicle exhaust, beedi industry smoke, handloom processing dust, and road dust to accumulate under often stable atmospheric conditions. These months experience higher temperatures and lower humidity, creating thermal inversions that trap pollutants near the surface, particularly during early mornings when fog sometimes forms. Sensitive groups like children, elderly, and those with respiratory conditions should limit outdoor exertion during these months, especially on visibly hazy days. The southwest monsoon from June to September brings dramatic improvement as heavy rains wash pollutants from the air, though flooding and landslides present different hazards. This period offers the cleanest air for outdoor activities despite high humidity. The post-monsoon period from October to January sees moderate conditions with occasional pollution spikes during festive seasons when fireworks and increased traffic occur. Northeast monsoon rains in October-November provide additional cleansing. Wind patterns shift seasonally, with sea breezes offering better dispersion during monsoon months but sometimes carrying marine aerosols. For optimal air quality, plan outdoor activities during monsoon months while being mindful of weather hazards, and use protective measures during the February-April peak when ventilation is poorest.